Despite the volume of research on Building defect, Defect remains major building construction problems. This paper examines the defect in building services equipment in tertiary across Lagos megacity Nigeria. To achieved the aim of the study, two hundred and fifty (250) was randomly administered among selected students across all tertiary institutions of Lagos megacity. The result of the findings revealed that maintenance aspects of the building are still weak in all the tertiary institutions of Lagos megacity. The study concludes the need to an established linkage between the students (users), and management of that institution (owners) to arrest building defects in time. However, the study further recommends the involvement of built professionally in every construction activities across the tertiary institution of Lagos megacity and Nigeria.